年代学

The major research subject in the paper are multiple aliquot OSL dating method of the fine grain (4-11μm) fractions and application of the method for OSL dating of loess and water-laid sediments from North China.

本文的主要研究内容为细颗粒多测片的沉积物光释光测年方法及其应用于中国北方黄土及水沉积物的年龄测定和年代学研究。

SHRIMP zircon U-Pb ages of gabbro, anorthosite, and plagiogranite from the ophiolitic complex, and related marginal granite in the Jinshajiang area, provides important geochronological constraints for the oceanic spreding, the subduction and final collision, therefore, which constructs a time framework for the Jinshajiang Paleo-Tethys evolution.

应用SHRIMP方法测定了金沙江蛇绿岩中的各类辉长岩，斜长岩，斜长花岗岩，及沿金沙江带分布的陆缘型花岗岩的年龄，提供了洋壳形成，俯冲消减和碰撞造山事件等古特提斯演化的重要的同位素地质年代学制约，从而建立了金沙江古提斯演化的年代格架。

This site run by the University of Lausanne, Switzerland, offers free downloads of BioGraph software.

本网站是由瑞士的Lausanne大学主办的，提供了免费的生物年代学软件下载。

BioGraph is a program to aid the biochronological correlation of species by constructing concurrent range zones using a mathematical model. The basic idea is to construct a discrete sequence of coexistence intervals of species.

这种软件通过利用数学模型建立同时发生的范围区域，来反映物种间的生物年代学的相互映射关系，其基本目的是建立物种间共生的不连续次序。

By summing up the cyclicity, rock association and occurrence of volcanic rocks with their overlying and underlying contact relations and forming environment, and concerning the research results of isotope chronology and biostratigraphy, the Yixian formation of the working area may be subdivided into four members.

综合火山岩的旋回性特徵，岩石组合、岩石产出特徵，不同岩石组合的上、下接触关系和岩石形成环境的分析结果，结合同位素年代学及生物地层学的研究成果，区内义县组被划分成了4个岩性段。

This paper deals with the advance in the study of terrestrial Permian-Triassic boundary. At first, some index TPTB sections and their research backgrounds are introduced. Then, the research status on the synthesis of the TPTB, including biostratigraphy, eventostratigraphy, isotopic dating, magnetostratigraphy and sequence stratigraphy etc., is analyzed. Finally, the existing problems and the next research directions about the TPTB study are assessed.

着重介绍了几个目前陆相二叠系－三叠系界线研究的重点剖面及其生物地层学研究进展；分析了陆相二叠系－三叠系界线综合地层学研究现状，包括生物地层学、事件地层学、同位素年代学、磁性地层学和层序地层学等；剖析了陆相二叠系－三叠系界线地层学研究中存在的问题及进一步的研究方向。

The study focus on the distribution patterns of modern and fossil benthic foraminiferal fauna and their relationship with environmental variables, and the physical and chemical properties of the deep water.

本项目以西太平洋边缘中、深层水体为对象，利用微体古生物学、生物地球化学和年代学方法，通过对现代底栖有孔虫分布特征及其环境控制因子、柱状岩芯中底栖有孔虫属种和形态类型的分布特征、底层水体的温度及营养水平、各主要古环境演化事件时期浮游和底栖有孔虫14C年代学特征等主要内容的研究，综合探索了晚第四纪以来西太平洋边缘中层和深层水体的性质和流通状况的演化史。

Based on many previous studies of the Buqin Mountain, A′nyêmaqên and Kuhai-Sêrtang ophiolitic mêlange zones in the junction between the two orogenic belts and through further survey and isotope chronological study, the authors find that the three ophiolitic mélange zones are not independent but form a typical triple junction with respect to the composition, textures and structures, geometry and isotope chronology, i.e. the Qinling-Kunlun triple junction.

本文在前人对发育于两造山带衔接区的布青山、阿尼玛卿以及苦海—赛什塘3条蛇绿构造混杂带大量研究的基础上，通过进一步的调查以及同位素年代学研究发现，这3条蛇绿构造混杂带并非相互独立存在，它们在物质组成、结构构造、几何形态、同位素年代学特征上构成较为典型的三向联结构造，即秦—昆三向联结构造。

In this paper, four sections located respectively in Yadong-ZhergerLa in central Himalaya, Pai-Zaqu reach of Yalung-Tsangpo River, west slope section of NamuLa and east slope section of DuoxiongLa in Eastern Himalaya Syntaxis were chosen, and conventional and laser ~(40)Ar/~(39)Ar methods were used to build the framework of thermal evolution history of central-east part of Himalaya orogen, for the purpose of revealing the secret of uplif of central-east Himalaya.In Yadong district in central Himalaya, a retro-metamorphic high-pressure granulite and its country rock were focused and conventional ~(40)Ar/~(39)Ar tests were done.

本文选择位于喜马拉雅中段亚东地区的亚东—哲古拉剖面以及位于东喜马拉雅构造结的雅鲁藏布江沿岸派乡—扎曲段、那木拉峰西坡以及多雄拉峰东坡等四条剖面，利用精细的阶步加温和单次全熔~(40)Ar/~(39)Ar年代学方法，试图构建喜马拉雅中段及东喜马拉雅构造结岩体热史演化的年代学框架，以期解开喜马拉雅造山带中东段的抬升之谜。

Of the five stages deformation, the exact ages of the (2) and (3) were determined by 40Ar/39Ar method as 290 and 259 Ma respectively.2. New results on the metamorphic belts and associated metamorphism of the Xiaopu metamorphic rocksBased on detailed microtextural observations and occurrence of typical metamorphic minerals, five metamorphic belts in the Xiaopu metamorphic rocks are identified. From the north to the south, they are biotite belt, garnet belt, staurolite belt, andalusite belt, and sillimanite belt. I suggested that the metamorphic belts occurred in the Xiaopu area belongs to the high temperature/low pressure series, may have resulted from the later Permian crust extension at ca. 290 Ma.3. I suggest that there may have been a Carboniferous backarc basin along the southern slope of the Harlik Mountain.Detrital Zircon SHRIMP U-Pb dating indicated that the sedimentary age of the Julideneng formation lithic sandstone must be later than late Devonian, most likely is Carboniferous rather than previously thought Precambrian. Analyses on its geologic setting, location of provenance, and sedimentary environment suggest the Carboniferous strata may form in a lagged backarc basin bounded by backarc uplifts.5. Reconstruction of the post-Paleozoic tectonic evolution history of the Harlik MountainThe tectonic evolution of Harlik mountains since the Paleozoic were reconstructed as followings:(1) arc-affinity magmative activities occurred during the middle-Ordovician to early-Silurian;(2) the middle-Silurian to late-Devonian was a back-arc uplift stage;(3) back-arc extension featured the Carboniferous period;(4) post-collisional extension and/then compression during Permian;(5) at the Mesozoic, differential uplift developed; and (6) the late Cenozoic is the intra-continental re-orogen stage.6. Primary estimation of the crust shortening is madeThe folded pre-Mesozoic strata were used to estimate crust shortening along the Harliknanshankou-Koumenzi, Shichengzi-Baishitou, and Qincheng-Xiaopu sections. Their shortening ratios are 16.2%, 19.8%, and 20.1% respectively corresponding crust shortening are 4.3, 9, and 11.3 km.

根据Ar-Ar热年代学研究，精确测定了早二叠世伸展变形和晚二叠世挤压变形的峰期时代分别为290Ma和259Ma.2、提出了关于哈尔里克山南麓小铺一带变质带和变质作用的新认识根据显微观察资料和特征变质矿物的出现，把小铺一带的变质岩由SW向NE方向依次划分为黑云母带、石榴石带、十字石带、红柱石带和矽线石带等变质带；初步确定该区的变质作用属于中温-低压型，变质作用发生的时代为290Ma左右，是该区早二叠世地壳伸展的产物。3、首次提出哈尔里克山南麓在石炭纪可能发育弧后盆地的新观点根据哈尔里克山南麓原&居里得能组&岩屑砂岩的碎屑锆石SHRIMP U-Pb定年，确认这套地层的沉积不早于晚泥盆世，很可能是石炭纪，而不是前人所说的前寒武纪；结合对其区域地质背景、源区位置和沉积环境分析，推测该区石炭纪可能为滞后弧后盆地和弧后隆起区构造背景。4、进一步证明哈尔里克山不发育与岛弧演化相关的泥盆纪岩浆活动根据对代表性闪长岩和花岗岩的锆石SHRIMP年代学研究获得的新资料，结合该区已有相关资料的综合研究，确定哈尔里克山岩浆岩分别形成于奥陶纪-志留纪和石炭纪晚期-二叠纪，不存在泥盆纪的岩浆岩，进而认为该区泥盆纪不属于岛弧环境。5、重建了哈尔里克山古生代以来的地质演化过程根据区域资料以及本次研究所获得的资料，把哈尔里克山古生代以来的构造演化划分中奥陶世-早志留世为岛弧、中志留世-晚泥盆世为弧后区、石炭纪弧后伸展、二叠纪为后碰撞伸展与挤压、中生代差异隆升和晚新生代陆内再造山过程等构造阶段。6、初步估算了哈尔里克山地壳缩短率和缩短量根据前中生代地层褶皱估算的哈尔里克山南山口-口门子、石城子-白石头和沁城-小铺三条剖面的地壳缩短率分别为16.2%、19.8%和20.1%，相应的地壳缩短量分别为4.3km、9km和11.3km。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了